Originally Posted by M7C
I appreciate your response & don't mean to be argumentative but I'm going to see if I can get Yamaha to weigh in (having never tried contacting Yamaha I'm not sure if this will go anywhere or not). The wording really does seem to indicate you should not use both the same pre and amplified channels for any situation -- something I hoped I was wrong about. Hooking one speaker to both at the same time as you interpret it would require adapters and a major lack of common sense. A warning for that would be akin to the warning about not using this amp in a bathtub (not to say these warnings don't exist)!
I did call a local Yamaha repair facility and the guy wasn't much help. He said it's probably best to go with what the manual says.
To your point, I don't think these devices will blow up if connected that way. But they could become stressed in a way which would shorten the lifespan (I'm guessing it would be an impedance issue leading to excessive heat). It's a shame the manuals aren't better at explaining this. I didn't see any warning in the Z11 manual.
I also checked a similar recent model AVR, the more expensive Denon X8500H. While it doesn't expressly forbid anything either -- it does say when using "all" of the Pre Outs, you can turn the Speaker Outs off (which I'm sure is good for the unit). But it's kind of all or nothing. Also vague...
Set “Assign Mode” to “Pre Amplifier” if
connecting all channels to the Pre-out
terminals using an external amplifier.
This stops operation of the internal power
amplifier of this unit, reducing interference
in the pre amplifier created by the power
If I can get something out of Yamaha I'll report back. I think my other option here is to use the Zones. I didn't get an answer to that question but I'm pretty sure if I want to be wired for 5.x.4 AND a zone for a B speaker I would need the A3070. Even then I think there might be limitations on what would play on the B zone, I'm not sure about that either. My main source of music would be coming from the SPDIF or TOSLINK inputs.
This is a bit late but I just came upon your question and I think I might have an answer for you. Unfortunately the manual in some areas is not written very clearly. For a proper interpretation it's important to know the context.
Firstly and most importantly, the manual says:
"To prevent the generation of loud noises or abnormal sounds
, make sure the followings before making connections
"Before making connections" is key here. I am also convinced the loud noises and abnormal sounds they are referring to are thumping and buzzing that can occur when connecting RCA audio cables to live equipment. So if you think of it in this context, when they say:
"When using the PRE OUT jacks, do not connect speakers to the corresponding SPEAKERS terminals" they mean:
1) Initially, leave your speakers disconnected from your external amp.
2) Connect the Yamaha's pre-outs to your external amp first. Because your speakers aren't connected, no thumps, pops or buzzing.
3) NOW connect your speakers to the external amp.
This really has nothing to do with the Yamaha's internal amps. It has everything to do with being a precaution just in case you've forgotten to turn the external amp off before making your connections. That way you won't get startled or blow a speaker.
Therefore you should be fine using all the internal amps and pre-outs w/external amps simultaneously.
Hope this helps.